Filter.



A. RAHE.

FILTER. APPLICATION FILED 1330.15, 1908.

Patented Aug. 10, 1909. 2 SHEETS-SHEET 1.

mgama Fig. 4C.

A. RAHE. FILTER. APPLICATION FILED DEO.15, 1908. I 93$,561 v Patented Aug. 10, 1909.

2 sunk-SHEET 2.

- tion are particularly applica .ou'ter frames.

v UNITED STATES PATENT orr oa.

AUGUST RAHEJOF BRACKW'EDE, GERMANY, ASSIGNOR TO THE FIRM OF K. & TH. MOLLER GESELLSOHAFT MIT BESOHRANKTER HAFTUNG, OF BRAOKWEDE, GERMANY.

FILTER.

- Specification of Letters Patent.

Patented Aug. .10, 1909.

' Application filed December 15, 1908. Serial No. 467,694.

To all whom it may concern: Be it known that I, AUoUs'r RAHE, a citizen of the German.Empire, and resident of.

Brackwede, Province of Westphalia, Kingdom of Prussia, Empire of Germany, machinist, have invented certain new and use-' ful Improvements in a Filter, of which the following is a specification.

This invention relates to filters of the type in which the fluid to be filtered is passed into filter pockets.

Filters constructed accordin to my inven- To for filtering air which is used for cooling dynamos" and similar electrical machinery, said electrical machinery being usually run at very high speeds b means of steam turbines.

.In a ter constructed in' accordance; ith the present invention a plurality of frames open at one end and closed at the other are arranged side by side, and the filter pockets are formed by a length of filtering fabric which is folded around each frame whereby a filter pocket is formed in each frame, in

such a manner that each filter pocket is open at the 0 en end of its frame and there is only one thic ess of filtering fabric between the filter pockets of every two adjacent-frames.

The filtering fabric is folded tightly around each frame and is fastened at its ends to the The frames are adapted to be clamped more or less closel together and to beifixed in any desired reflrtive position to one another.

The frames are arranged in two alternating series, the open ends of all the frames of one series being arranged at the inlet end of the filter, and the open ends of all the frames of the' other series being arranged at the de- Thus, the open end livery end of the filter. ofeach frame will be arranged adjacent to the closed end of the next frame, and inversely.

The frames are fixed and fastened together preferably by means of clamping bars which mclose the frames as a Whole and which can be tightened up by suitable means such as a rightand left hand screw coupling device.

A. construction of apparatus embod ing the im rovements of this invention is ilustrated by way of example in .the accompanyigure-l 1s a sectlon on the line A-B 'of -D of Fig. 1; .Figi l is a perspective view of the apparatus. g. 5 is an enlarged view ofthe ter similar to that shown in Fig. 2,

showing also in cross section a suitable casmg in which the filter is supported.

In these firures, a, 5 area plurality of frames capab e of adylustment relatively to one another. f is a fi tering fabric of determined. width and of any desired length. It is fastened at its ends, 11, i, and is folded back and forth in. folds, corrugations, or zigzag layers or the likearound the series of frames a, -b so as to form pockets at between the folds of the filtering fabric within the said frames.

The frames (1, 'b of each pocket are closely surrounded by the filtering fabric f in such a manner that one thickness of filtering fabric serves as afiltering surface between every two adjacent pockets at.

The lower cross pleces of theframes a and bare formed with slots 7c which revent an.

accumulation 'of dust within t e frames. The frames a are open at the side, indicated by the arrow in for the a mission of the fluid to be filtered, andthe frames b are open at the side indicated by the arrow y for the delivery of the filtrate. Thus on the inlet end of the construction of filter shown in Fig. 2, the closed ends 1- of the frames 1) are located in the order of the even numbers of the .total series of frames, and the open ends a of theframes a are located in the order of the odd numbers, while the reverse arrangement obtains at the outlet end of the filter where the open ends 3 of the frames 5 are located in the order of the even numbers, and the closed ends t of the frames 0, are located in the order of the odd numbers of the total series of frames.

It is preferred to arrange the cross pieces '12, w on the outside of the frame longitudinals 8 (Figs. 2 and 4) atthe open ends at and Z/ of the frames 11, b so that the inlet ends shall be completely open in the straight. In some constructions the cross pieces v and to may be dispensed with altogether.

For the purpose of simultaneously adj usting and fixing the frames relatively to one another, the frames a are provided with shoulders or stops h and the frames 12 are provided with shoulders or stops 9 (Figs. 1 and tion of the arrows m, n (Fig. 1) by means of an adjusting device such as a right and left hand screw coupling d. 4

The jointing of the frames a ainst one another and of the interposed tering fabric is effected in the example shown by means of wedges e, e, inserted between the frame clamps and the outermost frames a, and acting in the direction of the arrows 0, (Fig. 2). This jointing may however be efl ec ted by any other means.

In Fig. 5 is shown a suitable casing in which the filter is suitably supported upon brackets 21, the casin suitable inlet and outl res ectively.

hat I claim is:

et passages 22 and .23

' 1. In a filter the combination of a length of filter fabric folded in azigzag like manner, a frame within each zigzag ocket, means for dis ilacing two adjacent rames toward each ot er in order to stretch the fabric, and means for securing frame and filter fabric in their stretched position, the ends of the fabric being secured.

2. In. a filter the combination of'a length of filter fabric folded in a zigzag like manner,

' a frame open at one end and closed at the other within. each zigzag pocket, means for displacing two adjacentframes toward each other:- in order to stretch the fabric, and means for securing frame and filter fabric in their stretched position, the ends of the fabric being secured. V

3. In a filter the combination of a length a of filter fabric secured at eachend and folded in a zigzag like manner, a frame within each zigzag pocket, extensions (g, h) oneach frame against which the clamping device being provided with bears for displacing the frame toward each other.

4'. In a filter the combination of a len th of filter fabric secured at each end and fol ed in a zigzag like manner, a frame within each zigzag pocket, the-borders of which at-the entrance and exit are attached on the outside of. the frame, means for dis lacing two adjacent frames toward each 0t er in order to stretch the filter fabric and means for securing the frames and filter cloth in their stretched position.

5. A filtercomprising a length of filter fabric folded in a zigzag like manner, a frame within each zigzag pocket, means for displacing two adjacent frames toward each other inorder to stretch the fabric, and means for securing frame and filter fabric in their stretched position.

6. In a filter'the combination of a plurality of frames open at one end and closed at the other arranged side by side with a length of filtering fabric fastened at its ends to the outerframes, and folded around each frame whereby a-filter pocket is formed in each frame open at the open end of the said frame, clamps for holding the frames together and wedges for applying pressure through said clamps to said frames, as set forth. y

In testimony whereof I have signed this specification in the presence of two subscribing Witnesses.

AUGUST n'A l-nc. Witnesses: HENRY HASPER, WoLnEMAR HAUPT. 

